The Lab Panel Your Doctor Is Probably Running Wrong

Dagmara Beine

Jun 22, 2026

There are two versions of this panel.

The BMP, the Basic Metabolic Panel, runs 8 tests. Glucose, kidney markers, and electrolytes. That’s it. No liver enzymes.

The CMP, the Comprehensive Metabolic Panel, runs 14 tests. Everything in the BMP plus your liver enzymes (ALT, AST, alkaline phosphatase) and proteins (albumin, total protein, bilirubin).

Many doctors order the BMP by default. It’s cheaper, it’s faster, and it covers the basics. And when they skip the CMP, they wipe out your liver markers completely.

And we are in the middle of a fatty liver epidemic.

Non-alcoholic fatty liver disease, now called metabolic-associated fatty liver disease, affects an estimated 25 to 40% of American adults. Most of them have no idea. There are no symptoms in the early stages. The earliest warning sign shows up on your liver enzymes, specifically ALT. If your doctor is only running a BMP, that warning never shows up. The disease moves quietly, sometimes for years, until it becomes something much harder to reverse.

So rule number one. Ask for the complete metabolic panel. The CMP, not the BMP. Every time.

Here are the four markers on a CMP I look at most closely, and the ones your doctor is probably calling normal when they aren’t.

1. Fasting glucose above 90 is not optimal. It’s the beginning.

Your lab says fasting glucose is normal up to 99 mg/dL. Prediabetes officially starts at 100.

I draw the line at 90.

Once your fasting glucose creeps above 90, your body is already starting to lose metabolic flexibility. You’re moving into the early stages of insulin resistance, the quiet process that, left alone, becomes prediabetes, then type 2 diabetes.

And it’s not just about diabetes. Elevated fasting glucose, even inside the normal range, is linked to a whole cascade of problems.

Cardiovascular disease. A large Korean study found cardiovascular risk starts climbing once fasting glucose passes 90. An Israeli study of nearly 11,000 healthy adults found that people with fasting glucose of 90 to 94 had a 47% higher risk, and those at 95 to 99 had a 53% higher risk, compared to people under 85.

Weight gain. Elevated glucose means elevated insulin, and insulin is your fat-storage hormone. You can’t lose weight easily when your insulin is high.

Hormone disruption. Insulin resistance drives estrogen dominance, worsens PCOS, fuels perimenopause symptoms, and disrupts your whole hormonal cascade.

Alzheimer’s disease. Researchers have started calling Alzheimer’s “type 3 diabetes” because insulin resistance in the brain is so closely tied to cognitive decline and dementia.

Inflammation, faster aging, fatty liver, cancer risk. High blood sugar feeds all of it.

If yours is 91 to 99 and your doctor told you you’re fine, you’re not in danger, and you’re not optimal either, and now is the time to step in with nutrition and movement, not in five years when you’re officially prediabetic. I wrote a whole post on exactly what to do when your glucose lands in that range, you can read it here.

Optimal fasting glucose is under 90 mg/dL, ideally in the low-to-mid 80s.

2. An ALT at the top of the normal range points to fatty liver or insulin resistance.

ALT is a liver enzyme, the most liver-specific marker on the panel. When liver cells are stressed or damaged, they leak ALT into your blood.

Your lab says ALT is normal up to 40, sometimes 56. The research says something different. The true healthy upper limit is closer to 19 for women and 30 for men. A landmark 2002 study in the Annals of Internal Medicine established that after excluding people with hidden metabolic risk factors.

So when your ALT comes back at 35 and your doctor says normal, I see a liver that’s starting to struggle. An ALT in the 30s and 40s is one of the earliest signs of metabolic fatty liver disease and insulin resistance. Your liver is storing fat. It’s inflamed. And it’s telling you, years ahead of time, that something needs to change.

This is exactly why the CMP matters and the BMP fails you. If your doctor only ran a BMP, this signal, the earliest catch we have for one of the fastest-growing diseases in the country, would be invisible.

If yours is creeping toward 40, especially alongside a fasting glucose over 90 or high triglycerides, that’s a fatty liver pattern, and it’s time to act.

Optimal ALT is roughly 10 to 26, ideally under 19 for women and under 30 for men.

3. Low albumin, even inside the range, matters more than you’d think.

Albumin is the most abundant protein in your blood. Your liver makes it. And it does two important things most people never hear about.

First, it shows how well you’re absorbing and using protein. Low albumin can mean you’re not eating enough, not digesting it well, or dealing with gut inflammation that’s getting in the way of absorption.

Second, and this is the one nobody talks about, albumin is your body’s master antioxidant. More than 70% of the free-radical-fighting capacity of your blood comes from albumin. It’s also a marker of inflammation. When your body is chronically inflamed, albumin drops.

And here’s why low-normal albumin is a quiet red flag. It’s one of the strongest predictors of longevity we have. A landmark review found that the risk of death rises in a graded way as albumin falls, even within the normal range. For every small drop in albumin, mortality risk climbed 24 to 56%.

Your lab says albumin is normal down to 3.4. I want yours at 4.0 or above.

If your albumin is 3.5 to 3.9, I’m asking the next questions. Are you eating enough protein? Are you digesting it? Is there hidden inflammation? Is your gut absorbing nutrients? A low-normal albumin is a clue worth chasing, not a number to skip past.

Optimal albumin is 4.0 to 5.0 g/dL.

4. Low alkaline phosphatase, the marker nobody checks when it’s low.

Alkaline phosphatase (alk phos, or ALP) is an enzyme tied to bone formation and liver and bile function. Doctors watch for high alk phos, because it can signal bone or bile duct problems.

Almost nobody looks at low alk phos. And low alk phos is telling you something. It often means you’re low in zinc or magnesium.

Alk phos needs zinc and magnesium to do its job. When you’re depleted in those minerals, your alk phos drops. One study found that among adults with low alk phos, nearly half were zinc deficient and more than half were magnesium deficient.

Zinc and magnesium deficiencies are common, and they touch almost everything. Immune function, sleep, hormone production, blood sugar regulation, mood, muscle function, and more than 300 enzyme reactions in your body. Low alk phos can also point to low stomach acid, an underactive thyroid, or low B12.

So when your alk phos comes back at 35 and your doctor says nothing because it isn’t high, I see a possible mineral deficiency worth looking into.

Optimal alkaline phosphatase is roughly 50 to 90 IU/L. If yours is below 50, think zinc, magnesium, thyroid, and digestion.

Your full CMP cheat sheet.

Compare YOUR numbers to these, not just the lab’s “normal.” High and low both tell a story, so here’s the quick read on each.

GLUCOSE: optimal under 90 mg/dL. High: insulin resistance, prediabetes. Low: over-fasting, reactive lows, adrenal stress.

BUN: optimal 10-16 mg/dL. High: dehydration, high protein, kidney stress. Low: low protein intake, overhydration.

CREATININE: optimal 0.8-1.1 mg/dL. High: kidney stress, or high muscle mass. Low: low muscle mass.

eGFR: optimal 90 or above. High: generally good. Low: reduced kidney filtration.

BUN/CREATININE RATIO: optimal 10-20. High: dehydration. Low: low protein, overhydration.

SODIUM: optimal 138-142 mEq/L. High: dehydration. Low: overhydration, adrenal issues.

POTASSIUM: optimal 4.0-4.5 mEq/L. High: kidney issues, or sample error. Low: diet, diuretics, GI losses.

CHLORIDE: optimal 100-106 mEq/L. High: dehydration, acid shift. Low: low stomach acid, fluid loss.

CO2 (bicarbonate): optimal 25-28 mEq/L. High: breathing or compensation. Low: low stomach acid, mineral loss, acidosis.

CALCIUM: optimal 9.2-10.1 mg/dL. High: parathyroid, excess vitamin D. Low: low vitamin D, low albumin.

TOTAL PROTEIN: optimal 6.5-7.8 g/dL. High: inflammation, dehydration. Low: low protein intake or absorption.

ALBUMIN: optimal 4.0-5.0 g/dL. High: dehydration. Low: low protein, poor digestion, inflammation.

GLOBULIN: optimal 2.4-2.8 g/dL. High: inflammation, immune activity. Low: immune or liver issues.

A/G RATIO: optimal 1.4-2.1. High: less common. Low: inflammation.

BILIRUBIN (total): optimal 0.2-0.8 mg/dL. High: liver or gallbladder, or Gilbert’s. Low: usually not a concern.

ALKALINE PHOSPHATASE: optimal 50-90 IU/L. High: bone or bile issues. Low: zinc or magnesium deficiency.

AST: optimal 15-25 U/L. High: liver or muscle. Low: rare, possible B6 deficiency.

ALT: optimal 10-26 U/L (under 19 women, under 30 men). High: fatty liver, insulin resistance. Low: rare, possible B6 deficiency.

The numbers matter most when you read them together. A few patterns I watch for:

Glucose over 90 with ALT over 30 is an insulin resistance and fatty liver pattern.

A high BUN to creatinine ratio usually means dehydration.

When AST runs higher than ALT (a ratio over 2), I think about alcohol or muscle. When ALT runs higher than AST, I think fatty liver.

The numbers matter most when you read them together. A few patterns I watch for:

Glucose over 90 with ALT over 30 is an insulin resistance and fatty liver pattern.

A high BUN to creatinine ratio usually means dehydration.

When AST runs higher than ALT (a ratio over 2), I think about alcohol or muscle. When ALT runs higher than AST, I think fatty liver.

Pull up your last CMP, or go get one. Make sure it’s the complete panel, not the basic one. Then read it against these optimal ranges instead of your doctor’s normal.

You’ll probably find at least one thing that’s been called normal for years and isn’t optimal at all.

Dagmara

The most radical act in a sick society is to heal yourself, and then gently help others heal too.

I built an AI prompt on my own clinical framework that reads a CMP the way I do. You paste your full panel in and get back my optimal-range read in about 30 seconds, every marker, every ratio, the patterns your doctor isn’t connecting, and exactly what to look into next. It’s the closest thing to having me read your labs without being in my practice, and it drops this week.

This post is for educational purposes only and does not constitute medical advice. Please work with your own healthcare provider for personalized care.